期刊
BIOCHEMICAL JOURNAL
卷 422, 期 -, 页码 503-512出版社
PORTLAND PRESS LTD
DOI: 10.1042/BJ20090194
关键词
calcium stores; glutamate; hippocampal neuron; lysosome; nicotinic acid-adenine dinucleotide phosphate (NAADP); neurotransmitter
资金
- Biotechnology and Biological Sciences Research Council
- Alzheimer's Research Trust: Research into Ageing
- National Institutes for Health [NS18710, HL513141]
- Newton Abraham Studentship
- BBSRC [BB/D018110/1, BB/G008523/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/G008523/1, BB/D018110/1] Funding Source: researchfish
NAADP (nicotinic acid-adenine dinucleotide phosphate) is an unusual second messenger thought to mobilize acidic Ca2+ stores, such as lysosomes or lysosome-like organelles, that are functionally coupled to the ER (endoplasmic reticulum). Although NAADP-sensitive Ca2+ stores have been described in neurons, the physiological cues that recruit them are not known. Here we show that in both hippocampal neurons and glia, extracellular application of glutamate, in the absence of external Ca2+ evoked cytosolic Ca2+ signals that were inhibited by preventing organelle acidification or following osmotic bursting of lysosomes. The sensitivity of both cell types to glutamate correlated well with lysosomal Ca2+ content. However, interfering with acidic compartments was largely without effect on the Ca2+ content of the ER or Ca2+ signals in response to ATP. Glutamate but not ATP elevated cellular NAADP levels. Our results provide evidence for the agonist-specific recruitment of NAADP-sensitive Ca2+ stores by glutamate. This links the actions of NAADP to a major neurotransmitter in the brain.
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